<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    console.log(Math.abs(1/3-(1-2/3))<0.001)
  //保证代码可读性，用该方法
    var  arr=[1,2,3,4,5,"hello",null,true]
    console.log(arr)
    console.log(arr[2])
    new Array(1,2,3,4,'ww')
    // Person person = new Person(1,2,3,4,5);
    var person ={
      name:"zhangsan",
      age:3,
      tags:['js','java','web']
    }
    console.log(person.name);
    person.name;
  </script>
</head>
<body>

</body>
</html>